
B–63503EN–1/01
2. PREPARATIONS FOR OPERATION
89
The mode select signal is a code signal consisting of the three bits MD1,
MD2, and MD4. The seven modes -- memory edit (EDIT), memory
operation (MEM), manual data input (MDI), manual handle/incremental
feed (HANDLE/INC), manual continuous feed (JOG), TEACH IN JOG,
TEACH IN HANDLE -- can be selected. And in addition, DNC operation
mode can be selected by combining the (MEM) mode setting and the
DNCI signal. Manual reference position return mode can be selected by
combining the manual continuous feed (JOG) mode setting and the ZRN
signal.
The currently selected operation mode can be posted by outputting the
operation mode check signal.
[Classification] Input signal
[Operation] As shown in the following table, the mode select signal is a grey code (a
code in which only one bit is different from that of the adjacent mode).
To prevent faulty mode switching, use an overcrossing contact rotary
switch so that only one bit changes from that of the adjacent mode.
”Faulty mode switching” means” for example:
When the mode is switched to the EDIT mode during memory operation,
the CNC enters the single block state and the operation stops at the end
of the executing block.
For this mode switching, only MD2 should change from 0 to 1. If a
transient signal status change occurs in a signal other than MD2 during
mode switching, however, another mode (manual continuous feed mode,
for example) is set between automatic operation mode and memory edit
mode. When manual continuous feed mode is set while the CNC is in
automatic status, the CNC immediately stops memory operation. As a
result, although the operator intends to switch the mode to the memory
edit mode, the CNC is, instead, placed in the feed hold state.
2.6
MODE SELECTION
General
Signal
Mode selection signal
MDI, MD2, MD4
<G043#0∼#2>
DNCI <G043#5>
ZRN <G043#7>